Biotite

biotite

What is biotite?

As noted above, biotite is a name used for a number of black mica minerals that have different chemical compositions but very similar physical properties. These minerals generally cannot be distinguished from one another without laboratory analysis.

How do you clean biotite?

Biotite is very hard to clean because if washed it will absorb water internally and start to break apart. The best way to wash Biotite and other Micas is with a dry electric toothbrush. Black, dark brown, dark green, reddish black. Individual group member minerals such as Phlogopite and Eastonite can be in lighter colors.

How thick is biotite specimen?

Specimen is approximately 3/8 inch (.95 centimeter) thick. As noted above, biotite is a name used for a number of black mica minerals that have different chemical compositions but very similar physical properties. These minerals generally cannot be distinguished from one another without laboratory analysis.

Is biotite still used to describe dark micas?

The term biotite is still used to describe unanalysed dark micas in the field. Biotite was named by J.F.L. Hausmann in 1847 in honor of the French physicist Jean-Baptiste Biot, who performed early research into the many optical properties of mica.

What is a biotite mineral?

Biotite Minerals. As noted above, biotite is a name used for a number of black mica minerals that have different chemical compositions but very similar physical properties. These minerals generally cannot be distinguished from one another without laboratory analysis.

What is Biotite usually altered to?

Biotite is usually altered to clay minerals montmorillonite and vermiculite. Biotite and muscovite are the two most common mica minerals that often occur together in Al-rich igneous rock.

Is biotite the same as mica?

Although biotite is sometimes called black mica, it occurs in other colors, including brown, greenish-brown, yellow, and even white. Biotite occurs with other types of mica, even within a single rock. The primary use of biotite is to date the minimum age of rocks and geological features.

Is biotite a solid solution series?

2. It is primarily a solid-solution series between the iron - endmember annite, and the magnesium -endmember phlogopite; more aluminous end-members include siderophyllite and eastonite. Biotite was regarded as a mineral species by the International Mineralogical Association until 1998, when its status was changed to a mineral group.

What is the size of biotite?

Biotite: Biotite from Bancroft, Ontario, Canada. Specimen is approximately 4 inches (10 centimeters) across. What is Biotite? Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks.

Is biotite a solid solution series?

2. It is primarily a solid-solution series between the iron - endmember annite, and the magnesium -endmember phlogopite; more aluminous end-members include siderophyllite and eastonite. Biotite was regarded as a mineral species by the International Mineralogical Association until 1998, when its status was changed to a mineral group.

What is the difference between biotite and mica?

Biotite is also sometimes called black mica as opposed to white mica ( muscovite) – both form in the same rocks, and in some instances side by side. Like other mica minerals, biotite has a highly perfect basal cleavage, and consists of flexible sheets, or lamellae, which easily flake off.

What is the difference between thin sheets and biotite sheets?

Thin sheets are transparent to translucent, books are opaque. Biotite is very easy to identify, and with a little experience a person will be able to recognize it on sight.

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